netdev - Re: [pull request][net-next V10 00/14] Add mlx5 subfunction support

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Message-ID: <CACKFLimAQtVSbo7mw6_CGU5E_a_by+9rwsh0HwXW7gZ_jaCdfA@mail.gmail.com>
Date:   Mon, 25 Jan 2021 12:22:27 -0800
From:   Michael Chan <michael.chan@...adcom.com>
To:     Edwin Peer <edwin.peer@...adcom.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>, Parav Pandit <parav@...dia.com>,
        Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>,
        David Ahern <dsahern@...nel.org>,
        Kiran Patil <kiran.patil@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [pull request][net-next V10 00/14] Add mlx5 subfunction support

On Mon, Jan 25, 2021 at 12:09 PM Edwin Peer <edwin.peer@...adcom.com> wrote:
>
> On Mon, Jan 25, 2021 at 11:49 AM Jason Gunthorpe <jgg@...dia.com> wrote:
>
> > I've never seen someone implement a NumVF > 256 by co-opting the bus
> > number.
>
> Usually the VF offset already places the VF routing IDs into a
> different bus number range from the PF. That much at least works
> today.
>
> > Can Linux even assign more bus numbers to a port without firmware
> > help? Bus numbers are something that requires the root complex to be
> > aware of to setup routability.
>
> I'm not sure, presumably something already infers this for the first
> additional bus number based on the SR-IOV config capability?
>

Yes, this should work.  During enumeration, it sees that a device
capable of SRIOV needs more than one bus number and will assign the
proper primary and secondary bus numbers to the upstream bridge.

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